The credit for putting forward the theory of stem cells goes to a Russian histologist, Alexander Maksimov, who propounded that all cellular blood components were obtained from Haematopoietic stem cells. This was in 1908. The next major development in this field came after nearly 60 years when Joseph Altman and Gopal Das scientifically proved regular stem cell activity in the brain but their findings were in conflict with the “no new neurons” theory of Santiago Ramon Cajal. It was only in 1963 that James E. Till and Ernest A. McCulloch from Canada exhibited the self renewing cells present in the bone marrow of the mice. The credit goes to them for at least producing scientific evidence about the existence of it though Maskimov named and suggested its presence.